Highlight fields in registration

Hi there, I am sorry to bother you with such a question but I have ran out of options so... My problem is when customer is going through registration process and by mistake he doesn't fill all required fields, the registration process doesn't allow him to continue but there's no warning about it and he has to search for where he forgot to fill up the required field.

So I would like - when this happens - to show those forgotten fields highlited in red color or something like that.... is it possible somehow?